Cards: 3x2 front/back sprites, appearance overlays, flip via the Toggle menu

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Decentralized.Domain/CardLook.cs

@@ -22,6 +22,16 @@ namespace Decentralized.Domain
 
         public const int Variants = 3;
 
+        /// <summary>五位数字，存在物品标签上：风扇、金手指、挡板、丝印、贴纸。</summary>
+        public string Encode() => $"{Fan}{Fingers}{Bracket}{Print}{Sticker}";
+
+        public static CardLook Decode(string s)
+        {
+            if (s == null || s.Length != 5) return default;
+            int D(int i) => Math.Max(0, Math.Min(Variants - 1, s[i] - '0'));
+            return new CardLook { Fan = D(0), Fingers = D(1), Bracket = D(2), Print = D(3), Sticker = D(4) };
+        }
+
         /// <summary>只在假卡上出现的取值：玩家一旦看到，就能肯定是假的。</summary>
         public bool HasFakeSign => Bracket == 2 || Print != 0 || Sticker == 1;
 

src/Decentralized.Domain/Mining.cs

@@ -84,6 +84,8 @@ namespace Decentralized.Domain
         public double Health = 100;
         public bool Dead;
         public bool Refurbished;
+        /// <summary>外观；新卡（正规渠道）没有记录，按全新画。</summary>
+        public CardLook Look;
 
         public HardwareSpec Label => Hardware.Specs[Model];
         public HardwareSpec Chip => Hardware.Specs[FakeOf ?? Model];

src/Decentralized.Domain/RigSlots.cs

@@ -9,7 +9,7 @@ namespace Decentralized.Domain
     public static class RigSlots
     {
         public const int Base = 2, Max = 5;
-        public const int CellWidth = 2, CellsPerSlot = 2;
+        public const int CellWidth = 3, CellsPerSlot = 2;
 
         /// <summary>升级到第 n 个槽需要的电子元件（物品 id，件数）。n 从 3 开始。</summary>
         public static (string Item, int Count) Cost(int slot)
@@ -45,7 +45,7 @@ namespace Decentralized.Domain
             return take;
         }
 
-        /// <summary>显卡格子的形状字符串：宽 2，高 2 × 最大槽数；前 slots × 2 行可放（0），其余不可放（1）。</summary>
+        /// <summary>显卡格子的形状字符串：宽 3（一张卡 3×2 格），高 2 × 最大槽数；前 slots × 2 行可放（0），其余不可放（1）。</summary>
         public static string Shape(int slots)
         {
             var sb = new System.Text.StringBuilder();